svg animation point pulse - animation

Question

im trying to make a pulsing SVG animation. You can see it here:
http://jsfiddle.net/z2Cm9/
<g transform="translate(0,0)">
<polyline fill="none" stroke="#000000" stroke-miterlimit="10" points="9.5,9.583 24.5,36 39.5,9.75"/>
<animateMotion path="M 0,0 0,10 z" fill="freeze" dur="1s" repeatCount="indefinite"></animateMotion>
</g>
<g>
<polyline fill="none" stroke="#000000" stroke-miterlimit="10" points="0,48.5 24.75,48.5 50,48.5 " >
<animate
id="animation1"
attributeName="points"
from="0,48.5 24.75,48.5 50,48.5"
to="20,48.5 24.75,48.5 30,48.5"
dur="0.5s"
/>
<animate
id="animation2"
attributeName="points"
from="20,48.5 24.75,48.5 30,48.5"
to="0,48.5 24.75,48.5 50,48.5"
begin="animation1.end"
dur="0.5s"
/>
<animate
id="animation3"
attributeName="points"
from="0,48.5 24.75,48.5 50,48.5"
to="20,48.5 24.75,48.5 30,48.5"
begin="animation2.end"
dur="0.5s"
/>
</polyline>
</g>
As you can see it pulsates only once now. I want the movement of the line on the bottom to repeat. But cant seem to find a way to do this nicely. Is it for instance possible to add more then one stage. Like from, to, to etc?
Hope I asked the right way this time.
greetings!

Answer 1

Like so?
<animate
id="animation1"
attributeName="points"
from="0,48.5 24.75,48.5 50,48.5"
to="20,48.5 24.75,48.5 30,48.5"
begin="0s;animation3.end;"
dur="0.5s"
/>
The initial animation is triggered both by the beginning of time and the last animation finishing so it all repeats.